N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chloride → HCID 71571673、化合物
反応式
[OH:1][N:2]=[C:3](Cl)[C:4]1[CH:15]=[CH:14][C:7]2[B:8]([OH:13])[O:9][C:10]([CH3:12])([CH3:11])[C:6]=2[CH:5]=1.[Cl:17][C:18]1[CH:23]=[C:22]([C:24]([C:26]([F:29])([F:28])[F:27])=[CH2:25])[CH:21]=[C:20]([Cl:30])[C:19]=1[CH:31]([F:33])[F:32]>CN(C=O)C>[Cl:17][C:18]1[CH:23]=[C:22]([C:24]2([C:26]([F:29])([F:27])[F:28])[O:1][N:2]=[C:3]([C:4]3[CH:15]=[CH:14][C:7]4[B:8]([OH:13])[O:9][C:10]([CH3:12])([CH3:11])[C:6]=4[CH:5]=3)[CH2:25]2)[CH:21]=[C:20]([Cl:30])[C:19]=1[CH:31]([F:32])[F:33]参加物
4
実験手順
To a solution of crude N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chloride (156 mg, 0.65 mmol) and 1,3-dichloro-2-(difluoromethyl)-5-(3,3,3-trifluoroprop-1-en-2-yl)benzene (210 mg, 0.72 mmol) in DMF (8 mL) at rt was added TEA (100 μL, 0.72 mmol). The reaction mixture was stirred for 12 h, poured into ice-water and extracted with EA. The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by prep-TLC eluted with PE-EA (3:2) and then purified by combiflash to give the title compound 5-(5-(3,5-dichloro-4(difluoromethyl)phenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl)-3,3-dimethyl-benzo[c][1,2]oxaborol-1(3H)-ol (90 mg; yield 28% over 3 steps) as a white solid. 1H NMR (500 MHz, DMSO-d6): δ 9.268 (s, 1 H), 7.796 (s, 2H), 7.757-7.771 (m, 2 H), 7.694-7.710 (m, 1H), 7.389 (t, J=52.0 Hz, 1 H), 4.451 (d, J=18.0 Hz, 1 H), 4.344 (d, J=18.0 Hz, 1 H), 1.476 (s, 6 H); HPLC purity: 99.28% at 220 nm and 100% at 254 nm; MS: m/z=494.0 (M+1, ESI+).